Question

(a) Determine the critical value for a right-tailed test of a population mean at the α = 0.1 level of signiﬁcance with 22 degrees of freedom.
(b) Determine the critical value for a left-tailed test of a population mean at the α = 0.01 level of signiﬁcance based on a sample size of n = 40.
(c) Determine the critical values for a two-tailed test of a population mean at the α = 0.01 level of signiﬁcance based on a sample size of n = 33.